“What is the best way to store a 2000mAh cell phone battery for 1 to 2 years, charged or as it is packed?”

(Answer requested by Md-Abdur-Rahim)

Store it the same way it probably arrived from the factory: with about a 30%-40% charge, which is the “sweet-spot” for long-term storage with minimal self-discharge for LI-ion batteries.

Once charged to around 40%, carefully pack the battery in nonconductive material (e.g. a cardboard box), and then let it sit in a cool, dry place.

(Believe it or not, a refrigerator at around 40F/4C is a great place to store batteries, as long as they’re never frozen; are well protected from liquids and condensation; and are allowed to warm naturally/passively to normal room temperature before re-use.)

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